py3: Switch swift-dsvm-functional-py3 to run tests under py3
py3: Switch swift-dsvm-functional-py3 to run tests under py3

Now that all of the func tests are ported, we may as well run all-py3.

Change-Id: Ib9f75ca9efb46dc4c7730ad2718228ec7777c924

tipabu/swift,openstack/swift,tipabu/swift,openstack/swift,openstack/swift,tipabu/swift,swiftstack/swift,tipabu/swift,swiftstack/swift,openstack/swift,swiftstack/swift